Year	US Dollars adjusted for inflation)
1991	13761.778
1992	12857.612
1993	11934.577
1994	11787.194
1995	11617.941
1996	11764.834
1997	11875.513
1998	11950.747
1999	12032.869
2000	12384.031
2001	11571.373
2002	11860.784
2003	12863.572
2004	14076.724
2005	14193.044
2006	14231.312
2007	14659.726
2008	14915.424
2009	14327.575
2010	14633.467
2011	14798.765
2012	14687.067
2013	14481.694
2014	14734.632
2015	14956.289
2016	14968.366
2017	14994.049
2018	15529.571
2019	15981.93
2020	16384.82
2021	16805.893
2022	17215.289